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Practice Class 9 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn evaporation, neutron discovery, velocity, phloem, work, and important science concepts with detailed solutions for CBSE and State Board exams
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Chapter Information
Subject: Science
Class: 9
Chapter: Mixed Science Concepts (Physics, Chemistry & Biology)
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: NCERT Latest Syllabus
Introduction
Science helps us understand the natural world through observation, experiments, and logical thinking. In Class 9 Science, students study important concepts from Physics, Chemistry, and Biology that form the foundation for higher classes. Practicing MCQs improves conceptual understanding, problem-solving skills, and exam performance.
What You Will Learn?
✔ Evaporation and Physical Changes
✔ Discovery of Neutron
✔ Difference between Speed and Velocity
✔ Functions of Plant Tissues
✔ SI Unit of Work
✔ Important Scientific Concepts
✔ NCERT-Based Practice
✔ Board Exam Preparation
Why This Topic Is Important?
These concepts frequently appear in school examinations and competitive tests. Understanding them helps students build strong scientific reasoning and prepares them for advanced topics in Physics, Chemistry, and Biology.
Exam Relevance
These questions are useful for:
✔ CBSE Board Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Scholarship Examinations
Q1. Evaporation causes:
A) Heating
B) Freezing
C) Melting
D) Cooling
Answer:
Cooling
Useful Formula / Fact for this Question:
Evaporation absorbs heat from the surroundings, producing a cooling effect.
Concept Behind This Question:
Students should understand that evaporation is a surface phenomenon in which a liquid changes into vapour by absorbing heat energy.
Step-by-Step Solution:
During evaporation,
- Liquid particles absorb heat.
- The fastest particles escape into the air.
- Heat is taken from the surroundings.
Therefore, the surroundings become cooler.
Hence, the correct answer is:
Cooling
Exam Tip:
Remember that evaporation always produces a cooling effect.
Q2. Neutron was discovered by:
A) Bohr
B) Rutherford
C) Chadwick
D) Dalton
Answer:
Chadwick
Useful Fact for this Question:
The neutron was discovered by James Chadwick in 1932.
Concept Behind This Question:
Students should know the scientists responsible for the discovery of fundamental particles.
Step-by-Step Solution:
- Electron → J. J. Thomson
- Proton → Ernest Rutherford
- Neutron → James Chadwick
Therefore, the correct answer is:
Chadwick
Exam Tip:
Remember the pair:
Neutron → James Chadwick
Q3. Velocity includes:
A) Direction
B) Speed
C) Time
D) Distance
Answer:
Direction
Useful Formula for this Question:
Velocity = Displacement ÷ Time
Concept Behind This Question:
Velocity is a vector quantity because it has both magnitude and direction.
Step-by-Step Solution:
Speed tells only how fast an object moves.
Velocity tells:
- Speed
- Direction
Therefore, the unique characteristic of velocity is:
Direction
Hence, the correct answer is:
Direction
Exam Tip:
Whenever you see “velocity,” think of direction.
Q4. Phloem transports:
A) Oxygen
B) Food
C) Minerals
D) Water
Answer:
Food
Useful Fact for this Question:
Phloem transports prepared food from leaves to different parts of the plant.
Concept Behind This Question:
Students should know the functions of xylem and phloem tissues.
Step-by-Step Solution:
- Xylem transports water and minerals.
- Phloem transports food.
Therefore, the correct answer is:
Food
Exam Tip:
Remember:
Xylem → Water
Phloem → Food
Q5. The SI unit of work is:
A) Watt
B) Joule
C) Newton
D) Pascal
Answer:
Joule
Useful Formula for this Question:
Work = Force × Displacement
SI Unit:
Joule (J)
Concept Behind This Question:
Students should know the SI unit used to measure work.
Step-by-Step Solution:
- Watt → Power
- Newton → Force
- Pascal → Pressure
- Joule → Work
Therefore, the correct answer is:
Joule
Exam Tip:
Do not confuse Joule (Work) with Watt (Power).
Important Formulas & Concepts
1. Evaporation
Evaporation is the process in which a liquid changes into vapour from its surface and causes cooling.
2. Discovery of Neutron
Scientist:
James Chadwick
Year:
1932
3. Velocity
Velocity = Displacement ÷ Time
Velocity is a vector quantity because it has direction.
4. Phloem
Function:
Transports prepared food from leaves to all parts of the plant.
5. Work
Work = Force × Displacement
SI Unit:
Joule (J)
FAQs
1. Why does evaporation cause cooling?
Because it absorbs heat from the surroundings.
2. Who discovered the neutron?
James Chadwick discovered the neutron in 1932.
3. What is the difference between speed and velocity?
Speed has only magnitude, while velocity has both magnitude and direction.
4. What does phloem transport?
Phloem transports prepared food throughout the plant.
5. What is the SI unit of work?
The SI unit of work is Joule (J).
Common Mistakes
❌ Confusing evaporation with boiling.
❌ Mixing up neutron and proton discoverers.
❌ Thinking speed and velocity are exactly the same.
❌ Confusing xylem with phloem.
❌ Confusing Joule with Watt.
Quick Revision Notes
✔ Evaporation causes cooling.
✔ James Chadwick discovered the neutron.
✔ Velocity includes direction.
✔ Phloem transports food.
✔ SI unit of work = Joule.
✔ Work = Force × Displacement.
✔ Velocity = Displacement ÷ Time.
Conclusion
These Class 9 Science MCQs cover important concepts from Physics, Chemistry, and Biology based on the latest NCERT syllabus. Regular practice helps students strengthen conceptual understanding, improve accuracy, and perform better in school exams, CBSE board assessments, and scholarship examinations.
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